First of all let's not confuse Go's Interfaces with Java's class inheritance.
Read again the definition from the link you sent: "An interface type specifies a method set called its interface. A variable of interface type can store a value of any type with a method set that is any superset of the interface. Such a type is said to implement the interface." An interface type *specifies a method set* called its interface. So, an interface just specifies a set of methods that define that interface. A *variable *of interface type* can store* a value of any type with a* method set that is any superset* of the interface. A variable of a interface type (A) that contains at least all the methods in a another interface (B) can store a value of that interface. Such a type i*s said to implement *the interface So "implementing" an interface in Go actually means that you abide by a "contract" defined by the methods defined in that interface. Think of set theory, where the word "implements" could be replace by "contains or is equal to" (⊇) and "interface" would be a "set". Then think of "methods" as "elements". So saying that an interface A implements interface B, is similar to saying that set A contains or is equal to B, as it contains at least the same elements in B. On Wed, Jan 23, 2019 at 2:27 PM 伊藤和也 <kazya.ito.dr...@gmail.com> wrote: > I found the explanation "All types implement the empty interface". > https://golang.org/ref/spec#Interface_types > So an empty interface also implements an empty interface? and again the > empty interface implements an empty interface and the empty inter....... > What I imagine is like this below. > : > : > : > empty interface > | > empty interface > | > empty interface > | | | > int float64 bool > > In java, Object class is the top. > > Object > | > Creture > | | > Animal Human > | | > Dog Cat > > -- > You received this message because you are subscribed to the Google Groups > "golang-nuts" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to golang-nuts+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
